PHP XML Library：一个不错的PHP XML操作类
今天在PHP4环境下重新写一个接口程序，需要大量分析解析XML，PHP的xml_parse_into_struct()函数不能直接生成便于使用的数组，而SimpleXML扩展在PHP5中才支持，于是逛逛搜索引擎，在老外的网站上找到了一个不错的PHP XML操作类。一、用法举例：
1、将XML文件解释成便于使用的数组：
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[*]<?php
[*]include('xml.php'); //引用PHP XML操作类
[*]$xml = file_get_contents('data.xml'); //读取XML文件
[*]//$xml = file_get_contents("php://input"); //读取POST过来的输入流
[*]$data=XML_unserialize($xml);
[*]echo '<pre>';
[*]print_r($data);
[*]echo '</pre>';
[*]?>
<?phpinclude('xml.php'); //引用PHP XML操作类$xml = file_get_contents('data.xml'); //读取XML文件//$xml = file_get_contents("php://input"); //读取POST过来的输入流$data=XML_unserialize($xml);echo '<pre>';print_r($data);echo '</pre>';?>
data.xml文件：
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[*]<?xml version="1.0" encoding="GBK"?>
[*]<video>
[*]<upload>
[*]<videoid>998</videoid>
[*]<name><!]></name>
[*]<memo><!]></memo>
[*]<up_userid>11317</up_userid>
[*]</upload>
[*]</video>
<?xml version="1.0" encoding="GBK"?><video><upload><videoid>998</videoid><name><!]></name><memo><!]></memo><up_userid>11317</up_userid></upload></video>
利用该XML操作类生成的对应数组（汉字编码：UTF-8）：
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[*]Array
[*](
[*] => Array
[*] (
[*] => Array
[*] (
[*] => 998
[*] => 回忆未来
[*] => def
[*] => 11317
[*] )
[*]
[*] )
[*]
[*])
Array( => Array ( => Array ( => 998 => 回忆未来 => def => 11317 ) ))
2、将数组转换成XML文件：
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[*]<?php
[*]include('xml.php');//引用PHP XML操作类
[*]$xml = XML_serialize($data);
[*]?>
<?phpinclude('xml.php');//引用PHP XML操作类$xml = XML_serialize($data);?>
二、PHP XML操作类源代码：
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[*]<?php
[*]###################################################################################
[*]#
[*]# XML Library, by Keith Devens, version 1.2b
[*]# <a href="http://keithdevens.com/software/phpxml" target="_blank">http://keithdevens.com/software/phpxml</a>
[*]#
[*]# This code is Open Source, released under terms similar to the Artistic License.
[*]# Read the license at <a href="http://keithdevens.com/software/license" target="_blank">http://keithdevens.com/software/license</a>
[*]#
[*]###################################################################################
[*]
[*]###################################################################################
[*]# XML_unserialize: takes raw XML as a parameter (a string)
[*]# and returns an equivalent PHP data structure
[*]###################################################################################
[*]function & XML_unserialize(&$xml){
[*] $xml_parser = &new XML();
[*] $data = &$xml_parser->parse($xml);
[*] $xml_parser->destruct();
[*] return $data;
[*]}
[*]###################################################################################
[*]# XML_serialize: serializes any PHP data structure into XML
[*]# Takes one parameter: the data to serialize. Must be an array.
[*]###################################################################################
[*]function & XML_serialize(&$data, $level = 0, $prior_key = NULL){
[*] if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"\n"; }
[*] while(list($key, $value) = each($data))
[*] if(!strpos($key, ' attr')) #if it's not an attribute
[*] #we don't treat attributes by themselves, so for an emptyempty element
[*] # that has attributes you still need to set the element to NULL
[*]
[*] if(is_array($value) and array_key_exists(0, $value)){
[*] XML_serialize($value, $level, $key);
[*] }else{
[*] $tag = $prior_key ? $prior_key : $key;
[*] echo str_repeat("\t", $level),'<',$tag;
[*] if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element
[*] while(list($attr_name, $attr_value) = each($data["$key attr"]))
[*] echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"';
[*] reset($data["$key attr"]);
[*] }
[*]
[*] if(is_null($value)) echo " />\n";
[*] elseif(!is_array($value)) echo '>',htmlspecialchars($value),"</$tag>\n";
[*] else echo ">\n",XML_serialize($value, $level+1),str_repeat("\t", $level),"</$tag>\n";
[*] }
[*] reset($data);
[*] if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; }
[*]}
[*]###################################################################################
[*]# XML class: utility class to be used with PHP's XML handling functions
[*]###################################################################################
[*]class XML{
[*] var $parser; #a reference to the XML parser
[*] var $document; #the entire XML structure built up so far
[*] var $parent; #a pointer to the current parent - the parent will be an array
[*] var $stack; #a stack of the most recent parent at each nesting level
[*] var $last_opened_tag; #keeps track of the last tag opened.
[*]
[*] function XML(){
[*] $this->parser = &xml_parser_create();
[*] xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false);
[*] xml_set_object(&$this->parser, &$this);
[*] xml_set_element_handler(&$this->parser, 'open','close');
[*] xml_set_character_data_handler(&$this->parser, 'data');
[*] }
[*] function destruct(){ xml_parser_free(&$this->parser); }
[*] function & parse(&$data){
[*] $this->document = array();
[*] $this->stack = array();
[*] $this->parent = &$this->document;
[*] return xml_parse(&$this->parser, &$data, true) ? $this->document : NULL;
[*] }
[*] function open(&$parser, $tag, $attributes){
[*] $this->data = ''; #stores temporary cdata
[*] $this->last_opened_tag = $tag;
[*] if(is_array($this->parent) and array_key_exists($tag,$this->parent)){ #if you've seen this tag before
[*] if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])){ #if the keys are numeric
[*] #this is the third or later instance of $tag we've come across
[*] $key = count_numeric_items($this->parent[$tag]);
[*] }else{
[*] #this is the second instance of $tag that we've seen. shift around
[*] if(array_key_exists("$tag attr",$this->parent)){
[*] $arr = array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]);
[*] unset($this->parent["$tag attr"]);
[*] }else{
[*] $arr = array(&$this->parent[$tag]);
[*] }
[*] $this->parent[$tag] = &$arr;
[*] $key = 1;
[*] }
[*] $this->parent = &$this->parent[$tag];
[*] }else{
[*] $key = $tag;
[*] }
[*] if($attributes) $this->parent["$key attr"] = $attributes;
[*] $this->parent = &$this->parent[$key];
[*] $this->stack[] = &$this->parent;
[*] }
[*] function data(&$parser, $data){
[*] if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags
[*] $this->data .= $data;
[*] }
[*] function close(&$parser, $tag){
[*] if($this->last_opened_tag == $tag){
[*] $this->parent = $this->data;
[*] $this->last_opened_tag = NULL;
[*] }
[*] array_pop($this->stack);
[*] if($this->stack) $this->parent = &$this->stack$this->stack)-1];
[*] }
[*]}
[*]function count_numeric_items(&$array){
[*] return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0;
[*]}
[*]?>
<?php ################################################################################### # # XML Library, by Keith Devens, version 1.2b # <a href="http://keithdevens.com/software/phpxml" target="_blank">http://keithdevens.com/software/phpxml</a> # # This code is Open Source, released under terms similar to the Artistic License. # Read the license at <a href="http://keithdevens.com/software/license" target="_blank">http://keithdevens.com/software/license</a> # ################################################################################### ################################################################################### # XML_unserialize: takes raw XML as a parameter (a string) # and returns an equivalent PHP data structure ################################################################################### function & XML_unserialize(&$xml){ $xml_parser = &new XML(); $data = &$xml_parser->parse($xml); $xml_parser->destruct(); return $data; } ################################################################################### # XML_serialize: serializes any PHP data structure into XML # Takes one parameter: the data to serialize. Must be an array. ################################################################################### function & XML_serialize(&$data, $level = 0, $prior_key = NULL){ if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"\n"; } while(list($key, $value) = each($data)) if(!strpos($key, ' attr')) #if it's not an attribute #we don't treat attributes by themselves, so for an empty element # that has attributes you still need to set the element to NULL if(is_array($value) and array_key_exists(0, $value)){ XML_serialize($value, $level, $key); }else{ $tag = $prior_key ? $prior_key : $key; echo str_repeat("\t", $level),'<',$tag; if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element while(list($attr_name, $attr_value) = each($data["$key attr"])) echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"'; reset($data["$key attr"]); } if(is_null($value)) echo " />\n"; elseif(!is_array($value)) echo '>',htmlspecialchars($value),"</$tag>\n"; else echo ">\n",XML_serialize($value, $level+1),str_repeat("\t", $level),"</$tag>\n"; } reset($data); if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; } } ################################################################################### # XML class: utility class to be used with PHP's XML handling functions ################################################################################### class XML{ var $parser; #a reference to the XML parser var $document; #the entire XML structure built up so far var $parent; #a pointer to the current parent - the parent will be an array var $stack; #a stack of the most recent parent at each nesting level var $last_opened_tag; #keeps track of the last tag opened. function XML(){ $this->parser = &xml_parser_create(); xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false); xml_set_object(&$this->parser, &$this); xml_set_element_handler(&$this->parser, 'open','close'); xml_set_character_data_handler(&$this->parser, 'data'); } function destruct(){ xml_parser_free(&$this->parser); } function & parse(&$data){ $this->document = array(); $this->stack = array(); $this->parent = &$this->document; return xml_parse(&$this->parser, &$data, true) ? $this->document : NULL; } function open(&$parser, $tag, $attributes){ $this->data = ''; #stores temporary cdata $this->last_opened_tag = $tag; if(is_array($this->parent) and array_key_exists($tag,$this->parent)){ #if you've seen this tag before if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])){ #if the keys are numeric #this is the third or later instance of $tag we've come across $key = count_numeric_items($this->parent[$tag]); }else{ #this is the second instance of $tag that we've seen. shift around if(array_key_exists("$tag attr",$this->parent)){ $arr = array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]); unset($this->parent["$tag attr"]); }else{ $arr = array(&$this->parent[$tag]); } $this->parent[$tag] = &$arr; $key = 1; } $this->parent = &$this->parent[$tag]; }else{ $key = $tag; } if($attributes) $this->parent["$key attr"] = $attributes; $this->parent = &$this->parent[$key]; $this->stack[] = &$this->parent; } function data(&$parser, $data){ if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags $this->data .= $data; } function close(&$parser, $tag){ if($this->last_opened_tag == $tag){ $this->parent = $this->data; $this->last_opened_tag = NULL; } array_pop($this->stack); if($this->stack) $this->parent = &$this->stack; } } function count_numeric_items(&$array){ return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0; } ?>
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